GetSpigotBiome.java

Object2IntMap<String> map = new Object2IntOpenHashMap<>();

Path baseDir =  Paths.get(".").toAbsolutePath();
try (InputStream stream = Files.newInputStream(baseDir.resolve("biomes.json"))) {
    JsonNode biomes;
    try {
        biomes = GeyserConnector.JSON_MAPPER.readTree(stream);
    } catch (Exception e) {
        throw new AssertionError(LanguageUtils.getLocaleStringLog("geyser.toolbox.fail.runtime_java"), e);
    }
    Iterator<Map.Entry<String, JsonNode>> biomesIterator = biomes.fields();
    // Populate the existing biomes
    while (biomesIterator.hasNext()) {
        Map.Entry<String, JsonNode> entry = biomesIterator.next();
        map.put(entry.getKey(), entry.getValue().intValue());
    }
    // Add any new biomes
    for (Biome biome : Biome.values()) {
        if (!biomes.has(biome.toString())) {
            System.out.println("NEW BIOME! " + biome.toString());
            int value = biome.ordinal();
            if (value > 50) {
                value += 77;
            }
            map.put(biome.toString(), value);
        }
    }
} catch (NoSuchFileException e) {
    //
} catch (IOException e) {
    throw new RuntimeException(e);
}

try (OutputStream outputStream = Files.newOutputStream(baseDir.resolve("biomes.json"), StandardOpenOption.TRUNCATE_EXISTING, StandardOpenOption.CREATE)) {
    GeyserConnector.JSON_MAPPER.writer(new DefaultPrettyPrinter()).writeValue(outputStream, map);
} catch (IOException e) {
    throw new RuntimeException(e);
}